WO2006106732A1

WO2006106732A1 - Crime prevention sensor with frost protection step difference

Info

Publication number: WO2006106732A1
Application number: PCT/JP2006/306461
Authority: WO
Inventors: Hiroyuki Ikeda
Original assignee: Optex Co., Ltd.
Priority date: 2005-03-30
Filing date: 2006-03-29
Publication date: 2006-10-12
Also published as: CN100527177C; KR20070118671A; JPWO2006106732A1; CN1942908A; JP4748736B2; KR100937122B1; EP1868171A4; EP1868171A1; US20090059483A1; US7633067B2; EP1868171B1

Abstract

In order to produce an excellent frost protection effect without increasing the size, a crime prevention sensor is so structured that an element unit (21) including sensor elements (15, 23) for transmitting or receiving a detection wave IR is supported on the sensor body (41) such that the horizontal deflection angle and the vertical deflection angle θV can be adjusted, a cover (43) covering the element unit (21) is attached to the sensor body (41), and the center of rotation (10) of vertical deflection of the element unit (21) is shifted downward or upward from the central portion of the element unit (21) in the vertical direction. A recessed portion (56) of the cover (43) recessed from the other portion toward the inside of the cover (43) is formed in a part of the cover (43) corresponding to the part to which the center of rotation (10) of the element unit (21) is shifted through a stepped portion (44). A hood (17) for isolating at least a part of the region where the detection wave IR passes for the sensor element (23) from the sky is provided above and near the center of rotation (10) of the cover (43).

Description

Specification

Crime prevention sensor device having step for frost prevention

Technical field

TECHNICAL FIELD [0001] The present invention relates to a security sensor device having a frost-proof step on a cover and a frost-proof hood attached to a portion near the step in the cover.

Background art

[0002] As this type of security sensor device, infrared beam projectors and receivers are installed at both ends of a linear security area, and infrared beams are projected and received between the projector and receiver. However, it is known to detect a human body by detecting that an infrared beam is obstructed by the human body. In this security sensor device, the light projecting part and the light receiving part are united together and have substantially the same external shape (refer to Japanese Patent Laid-Open No. 10-039043).

[0003] There is a cover of a projection / reception device of such a security sensor device provided with a hood or a step so that the optical lens does not cover the sky. As a result, a part of the light transmission surface to the optical lens in the cover is blocked by the low-temperature sky cover and radiation cooling is suppressed. The infrared beam is prevented from being blocked by frost formation.

Disclosure of the invention

[0004] In order to increase the defrosting effect, however, it is necessary to use a hood with a large protrusion from the cover or a cover with a large level difference. This leads to a large size of the entire sensor device.

[0005] The present invention has been made in view of the above-described conventional problems, and provides a security sensor device capable of obtaining an excellent defrosting effect without causing an increase in the overall outer shape. It is intended.

[0006] In order to achieve the above object, the security sensor device according to the present invention includes an element unit including a sensor element that transmits or receives a detection wave in a sensor body, and has a horizontal deflection angle and a vertical deflection angle. A cover that is supported so as to be adjustable and covers the element unit is mounted on the sensor body, and the rotation center of the vertical deflection in the element unit is the element unit. It is set to be deviated downward or upward with respect to the central part in the vertical direction, and the part corresponding to the side where the rotation center of the element unit in the cover is decentered is arranged to be more than the other part via the step part. A recessed portion that is recessed inward of the cover is formed, and a hood that blocks aerodynamic force at least a part of the detection wave passage region with respect to the sensor element is provided near the upper portion of the rotation center of the cover. It has been.

[0007] According to this configuration, since the rotation center of the vertical deflection of the element unit is provided eccentrically downward or upward with respect to the central portion of the vertical direction of the element unit, the vertical deflection angle of the element unit is maximized. In this state, when the horizontal deflection angle is changed within a predetermined angle range, the rotation trajectory of the element unit is the minimum diameter in the horizontal plane of the outer end on the side where the rotation center is eccentric, and The rotation trajectory in the horizontal plane of the outer end on the opposite side becomes the maximum diameter, and a difference occurs between the diameters of the respective rotation trajectories between both ends in the vertical direction. Therefore, the cover that covers the element mute is designed so that the part corresponding to the side where the center of rotation is eccentric and the other part have the minimum rotation path diameter and maximum rotation path diameter in the element unit. By forming the smallest possible shape that can be included, it is possible to form a large step portion corresponding to the difference between the minimum rotation locus diameter and the maximum rotation locus diameter of the element unit between the two portions. .

[0008] With this, even if the same hood as that used in the past is used, the detection wave passing area of the cover in this hood, that is, the amount of protrusion from the recessed portion is larger than that of the conventional sensor device by the size of the stepped portion. Also grows. Along with this, in the detection wave passage area of the cover, the vertical width of the defrost effective area that is blocked from the sky by the hood is increased, the defrosting effect of the cover is improved, and the amount of detection wave passing through the cover is reduced. Can be suppressed. In addition, the part of the cover opposite to the side where the pivot center of the vertical deflection of the element unit is eccentric must be set to a shape larger than the outer shape of the conventional cover corresponding to the maximum trajectory pivot diameter of the element unit. The force element unit unit has a small vertical deflection angle range (usually 10 ° or less), so it can be kept slightly larger than the conventional force bar. In addition, the frost-proof effect can be improved while using existing food. For this reason, there is no large size of the entire outer shape.

In the present invention, it is preferable that the hood is supported by a non-recessed portion on the upper side of the stepped portion of the cover. According to this configuration, the detection wave in the recessed portion of the cover The amount of protrusion of the hood in terms of the passage area force is obtained by adding the dimension of the step to the protrusion length of the hood, so the vertical width of the defrosting effective area provided in the detection wave passage area of the cover is reliably set large. can do.

[0010] In the present invention, the element unit has a pair of upper and lower optical systems that project or receive infrared rays, and the hood is disposed on the optical system positioned on the eccentric side of the rotation center. Blocking can be performed. According to this configuration, for at least one of the upper and lower pair of light projecting system or light receiving system, the effective area for preventing frost formation is increased to effectively reduce the amount of detection wave passing through the cover. Can be suppressed.

In this case, an additional hood for performing the blocking with respect to the other optical system can be further provided on the cover. This additional hood does not increase the overall external dimensions of the cover, so that the detection wave passage area force of the cover is higher than one of the hoods located on the side where the center of rotation of the element unit in the cover is eccentric. It is preferable to reduce the amount of protrusion of. Even if the protrusion amount is reduced in this way, the decrease in the amount of detection wave passing through the detection wave due to frosting of the cover in the other optical system can be suppressed to some extent, and the detection failure by one sensor element can be compensated.

Brief Description of Drawings

The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the embodiments and drawings are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined by the appended claims. In the accompanying drawings, like reference numerals in a plurality of drawings indicate corresponding parts.

FIG. 1 is a block diagram showing a security sensor device according to a first embodiment of the present invention.

[FIG. 2] (a) to (c) are a right side view with a partially broken light receiving part in the security sensor device same as above and a right side view in two states with different vertical deflection angles of the element unit with respect to the sensor body.

FIG. 3 is a front view showing the security sensor device with the cover removed.

FIG. 4 is a longitudinal sectional view of an essential part showing the security sensor device according to the embodiment.

[Fig. 5] (a) to (e) are a plan view, a front view, a bottom view, a right side view, and a main view showing the light receiving section of the above It is a longitudinal cross-sectional view of a part.

FIG. 6 is a plan view, a front view, a bottom view, and a right side view showing a light receiving section in a security sensor device of a modification of the first embodiment.

[FIG. 7] (a) to (c) show a partially broken right side view of the light-receiving part and a vertical deflection angle of the element unit with respect to the sensor body in the security sensor device according to the second embodiment of the present invention. It is a right view of a state.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a security sensor device according to a first embodiment of the present invention. This security sensor device is an active type consisting of a light projecting unit 1 and a light receiving unit 2 that are installed so that their opposite optical axes coincide with each other on the walls or poles on both ends of a linear security area. Infrared detector, which transmits and receives infrared beam IR as a human body detection wave. The human body is detected by detecting by the light receiving unit 2 that the infrared beam projected from the light projecting unit 1 is blocked by the human body. The light projecting unit 1 and the light receiving unit 2 are configured to be united together as described later.

The light projecting unit 1 includes a light projecting side element unit 11, a light projecting drive circuit 12, a light projecting suppression circuit 13, and a light projecting side cover open / close detection switch 14. The element unit 11, the light projecting drive circuit 12, and the light projecting suppression circuit 13 are provided in plural, for example, a pair, but only one is shown in FIG. The element unit 11 includes a light-emitting element 15 such as an infrared light-emitting diode and a light-transmitting lens 16 for forming an infrared beam IR such as a near-infrared ray or a transmission-side optical system 16 such as a reflection mirror. Has been. The light projecting drive circuit 12 drives the light emitting element 15 to emit light at a predetermined frequency, and emits an infrared beam IR composed of a pulse modulated wave. The light emission side cover opening / closing detection switch 14 is a contact type or proximity type switch that detects opening / closing of a cover, which will be described later, with respect to a sensor body. When the cover open / close detection switch 14 detects the opening of the cover, the light emission suppression circuit 13 supplies the light emitting element 15 with driving power for reducing the infrared beam emitted from the light emitting element 15 by the amount of attenuation transmission by the cover. The light projecting drive circuit 12 is controlled as follows.

On the other hand, in the light receiving unit 2, the receiving side element unit 21 is like a light receiving lens or a condenser mirror. A receiving optical system 22 and a light receiving element 23 such as a phototransistor are provided as a light receiver. The receiving side element unit 21 receives the infrared beam IR from the light projecting unit 1 and outputs an electrical signal corresponding to the amount of received infrared light. This electric signal is amplified by the amplification circuit 24, and then the disturbance light is removed by the detection circuit 25 and converted into a signal corresponding to the level of the received light signal only by the pulse modulated wave. This signal level is detected by setting. The signal discrimination circuit 26 determines whether the level is below the level. When the infrared beam from the projector 1 is blocked by an illegal intruder and the received light signal level falls below the preset detection level, the detection signal is output from the signal discrimination circuit 26 and the alarm circuit 27 is driven. An alarm signal for notifying the existence of illegal intruders is output from the alarm circuit 27 to the security center, for example, not shown!

A level meter 29 such as a voltmeter connected to the detection circuit 25 displays a signal level proportional to the amount of infrared light received by the element unit 21. Further, the amplification circuit 24 is gain-controlled by the AGC circuit 30 in accordance with the signal level of the light reception signal from the element unit 21 and controlled so that the output is always below a certain signal level. A plurality of element units 21, amplifying circuits 24, detecting circuits 25, signal discriminating circuits 26, and level meters 29 are provided, for example, a pair, but only one is shown in FIG. The light receiving unit 2 further includes a light receiving side cover opening / closing detection switch 31 and a light receiving level suppressing circuit 32. The light receiving side cover opening / closing detection switch 31 is a contact type or proximity type switch that detects opening / closing of a cover, which will be described later, with respect to the sensor body. The light reception level suppression circuit 32 reduces the gain of the amplifier circuit 24 via the AGC circuit 30 when the cover open / close detection switch 31 detects the opening of the cover. Control is performed so that the signal level of the received light signal is reduced by the amount of attenuation transmission by the cover and amplified.

[0017] The light projecting unit 1 and the light receiving unit 2 have substantially the same external shape unitized together as described above. Therefore, the light receiving unit 2 shown in FIGS. 2A to 2C will be described as a representative. This light receiving section 2 is detachably mounted on a resin sensor body 41 mounted on a mounting surface S such as a wall or a pole shown in FIG. 2 (a), and on a base 42 of the sensor body 41. It has a power bar 43 made of greaves.

[0018] The light receiving element unit 21 includes a pair of upper and lower receiving optical systems 22 each including a light receiving lens. The first circuit board 46 is held inside the unit case 45, and the light receiving element 23 is located behind each receiving-side optical system 22 and the first circuit board 46 is held in the unit case 45. It is mounted and arranged. On the second circuit board 47 attached to the base 42, sensor circuits 21, 24-27, 29 to 32 having the configuration shown in FIG. 1 are mounted.

As shown in the front view of FIG. 3, a U-shaped holding body 8 is rotated around a vertical axis 9 facing the vertical direction on the support member 7 fixed to the lower front side of the base 42. The element unit 21 is rotatably supported around a pair of left and right horizontal shafts 10 in the horizontal direction shown in FIG. 2 (a). . The vertical axis 9 is, for example, a screw body (FIG. 4), and the horizontal axis 10 is a pin. Therefore, the horizontal deflection angle is variably adjusted by rotating the element unit 21 with the holding body 8 about the vertical axis 9 with respect to the base 42, and the element unit 21 is rotated relative to the holding body 8 about the horizontal axis 10. As a result, the vertical deflection angle can be modulated and adjusted, so that the optical axis can be aligned with the element unit 11 of the light projecting unit 1 in FIG. This optical axis adjustment is performed using a sighting device 36 described later.

[0020] The element unit 21 forms a rotation center for horizontal deflection of the unit case 45 of Fig. 3. The vertical axis 9 is provided at the center of the holding body 8 in the left-right direction. The horizontal axis 10 in FIG. 2A, which forms the turning center of deflection, is provided eccentrically downward with respect to the central portion of the unit case 45 in the vertical direction. The conventional horizontal axis 10 was provided at the center of the unit case 45 in the vertical direction.

The holding body 8 is formed with a dial 35 for performing an operation of adjusting the horizontal deflection angle of the element unit 21 by rotating the holding body 8 about the vertical axis 9. Further, as shown in FIG. 4, an adjustment screw 19 is rotatably inserted into the front wall 8a of the holding body 8, and the adjustment screw 19 is formed to protrude downward at the rear end portion of the unit case 45. It is screwed into the protruding part 33. Between this protrusion 33 and the front wall 8a of the holding body 8, a coiled spring body 34 that presses the protrusion 33, that is, the unit case 45 backward (to the right in FIG. 4) is attached to the adjustment screw 19. Inserted and installed. Therefore, if the dial 35 is rotated, the horizontal deflection angle of the element unit 21 can be adjusted together with the holding body 8, and if the adjustment screw 19 is rotated, the vertical deflection angle of the element unit 21 can be adjusted. Can be adjusted.

[0022] In the unit case 45 of the element unit 21 shown in FIG. A known sight 36 for adjusting the axis is provided. The sighting device 36 includes a pair of left and right observation windows 38 provided on the sighting device case 37, a pair of sighting holes 39 provided on the left and right of the front side, and a pair of left and right sighting devices provided in the sighting device case 37. Reflection mirror (not shown). The sighting device 36 adjusts the horizontal deflection angle or vertical deflection angle of the element unit 21 by manually operating the dial 35 or the adjustment screw 19 while looking through the observation window 38 with the cover 43 opened. By performing an operation so that the image of the element unit 11 of the light projecting unit 1 shown in FIG. 1 and the aiming hole 39 shown in FIG. 3 overlap each other, the optical axis is roughly adjusted. Following this coarse adjustment, fine adjustment of the optical axis is performed by adjusting the dial 35 and adjustment screw 19 in Fig. 3 so that the display level reaches the maximum value while viewing the display on the level meter 29 (Fig. 1). It is necessary to adjust the optical axes of light projecting unit 1 and light receiving unit 2 until the display of level meter 29 in Fig. 1 reaches the specified level or higher, that is, until the optical axis of light receiving unit 2 exactly matches light projecting unit 1. Repeat several times accordingly. The light projecting unit 1 has the same configuration as the light receiving unit 2 described above.

On the other hand, the cover 43 shown in FIG. 2 (a) is provided with a stepped portion 44 at a portion facing the central portion in the vertical direction of the element unit 21, and a non-recessed portion 55 is provided below the stepped portion 44. Recesses 56 Forces are formed respectively. That is, from the other non-recessed portion 55 through the stepped portion 44 to the portion corresponding to the lower side where the horizontal axis 10 which is the rotation center of the vertical deflection of the element unit 21 is eccentric with respect to the central portion of the element unit 21. In addition, a recessed portion 56 is formed which is recessed inward of the cover 43. Further, in the cover 43, a hood 17 is fitted on the outer peripheral surface of the non-recessed portion 55 and fixed with an adhesive at a location near the stepped portion 44 in the non-recessed portion 55 above the stepped portion 44. . The step 44 and the hood 17 prevent the infrared beam IR from being blocked by frost formation on the light transmission surface of the cover 43 due to radiative cooling in which heat is emitted from the surface of the cover 43 toward the sky at low temperatures in winter. Therefore, a part of the light transmission surface of the cover 43 (passage area of the infrared beam IR that is the detection wave) is shielded from the sky at a low temperature to suppress radiation cooling.

[0024] The element unit 21 has a pair of upper and lower optical systems 22 and a light receiving element 23, but requires a cover passage amount of the infrared beam IR for at least one of the optical system 22 and the light receiving element 23. If the value is secured, there is no problem in the human body detection function. In other words, hippopotamus It is only necessary to prevent the infrared beam IR from being blocked by frost formation on a part of the light transmission surface corresponding to at least one of the two optical systems 22 in 43. Therefore, in the above-described embodiment, only the lower optical system 22 is provided with the defrosting means by the step portion 44 and the hood 17, and details of this defrosting means will be described later.

[0025] The light receiving section 2 has a horizontal deflection angle variable range of 180 ° about the vertical axis 9 as a rotation center, and also rotates the horizontal axis 10 shown in FIGS. 2 (b) and 2 (c). The variable range of the vertical deflection angle 0 at the center is 5 °

V

Each is set as follows. Fig. 2 (b) shows a state in which the element unit 21 is rotated in the downward direction until the vertical deflection angle Θ is maximized. Fig. 2 (c) shows the element unit 21

V

Shows a state in which the vertical deflection angle Θ is turned to the maximum in the direction in which

V

. Fig. 2 When the horizontal deflection angle is changed by 180 ° in either state (b) or (c), the horizontal axis 10 that is the center of rotation of the vertical deflection angle Θ is decentered downward. Centered on 9

V

The diameters of the rotation trajectories of the upper end outline of the unit case 45 and the lower end outline are different. That is, when the horizontal deflection angle is changed by 180 ° with the element unit 21 in the above state, the diameter of the rotation locus of the upper end outer shape portion in the unit case 45 becomes the rotation locus maximum diameter D1 of the element unit 21, and The diameter of the rotation locus of the lower end outer shape portion of the unit case 45 is the rotation locus minimum diameter D2 of the element unit 21.

[0026] The maximum turning trajectory D1 of the turning trajectory of the upper end outer shape of the unit case 45 is a conventional one in which the horizontal axis 10 that is the center of rotation of the vertical deflection angle is set at the center in the vertical direction of the element unit 21. However, the variable range of the vertical deflection angle Θ is less than 5 °.

V

It is only slightly larger than the diameter. On the other hand, the minimum turning trajectory diameter D2 of the lower end outline of the unit case 45 is such that the horizontal axis 10 that is the center of rotation of the vertical deflection angle Θ is unit case 4

V

The diameter is smaller than the diameter of the conventional rotation locus by the amount deviated downward from the central portion of 5 in the vertical direction.

FIGS. 5 (a) to 5 (e) are a plan view, a front view, a bottom view, a right side view, and a longitudinal sectional view of the main part showing the light receiving unit 2, in which the hood 17 in the cover 43 is shown. The non-recessed portion 55 above the attachment site is set to have a shape that can include the maximum turning trajectory diameter D1 of the upper outer shape of the unit case 45. As described above, the maximum turning trajectory diameter D1 is Conventional sensor equipment The outer shape of the non-recessed portion 55 can be set to substantially the same size as the cover of the conventional sensor device. Therefore, the hood 17 that is fitted and fixed to the outer surface of the non-recessed portion 55 of the cover 43 can be of the same size as the existing one. As a result, the security sensor device does not cause an increase in the overall shape as compared with the conventional sensor device. The hood 17 has an eaves portion 17a projecting outward from the cover 43 and a mounting portion 17b, and is slightly recessed into the outer surface of the non-recessed portion 55 of the cover 43 as shown in FIG. The attachment portion 17b is fitted into the fitting portion 55a provided and fixed with, for example, an adhesive.

[0028] On the other hand, the recessed portion 56 below the mounting portion of the hood 17 in the cover 43 has a minimum turning trajectory diameter D2 of the lower end outer portion of the unit case 45 in FIG. The outer shape is reduced by an amount smaller than the diameter of the locus. Therefore, the stepped portion 44 of the cover 43 in FIG. 2 (a) is a large one that matches the dimensional difference between the non-recessed portion 55 and the recessed portion 56. As a result, the protrusion P1 of the eaves 17 1a of the hood 17 from the light transmission surface of the cover 43 shown in FIG. 5 (d) is the dimension of the step 44 when the hood 17 having substantially the same shape as the conventional one is used. Accordingly, the vertical width A of the defrosting effective area which is shaded against the sky is increased by the eaves portion 17a of the hood 17 on the light transmitting surface of the cover 43, and the defrosting effect is improved. As a result, this security sensor device does not cause an increase in the overall outer shape as described above, but prevents frost formation on a part of the light transmission surface of the cover 43 and prevents a pair of upper and lower pairs. It is possible to suppress a decrease in the amount of infrared beam IR passing through the lower optical system 22.

FIG. 6 shows a modification of the first embodiment, in which the same or corresponding parts as in FIG. 5 are given the same reference numerals. In the example of the figure, in the first embodiment, the hood 17 that shields the upper part of the light transmission surface of the infrared beam IR for the lower optical system 22 in the cover 43 from the sky is provided. An additional hood 17A is provided to block the upper part of the light transmission surface of the infrared beam IR for the optical system 22 from the sky. As this additional hood 17A, one having the same dimensions as the lower hood 17 is used.

[0030] In the above configuration, the protruding amount P2 of the upper hood 17A from the cover 43 is equal to the conventional sensor device. Therefore, the vertical width A2 of the defrosting effective area formed on the light transmission surface of the infrared beam IR with respect to the upper optical system 22 in the cover 43 is also the same as that of the conventional sensor device. However, since the additional hood 17A can suppress a decrease in the amount of the infrared beam IR passing through the upper light receiving element 23, the detection failure can be further complemented.

FIG. 7 shows a second embodiment of the present invention, in which FIGS. (A) to (c) correspond to FIGS. 2 (a) to (c) and are the same as or correspond to FIG. Are denoted by the same reference numerals. In the first embodiment, the horizontal axis 10 that is the rotation center of the vertical deflection angle Θ is set downward with respect to the central portion of the element unit 21.

V

In this embodiment, it is provided at an eccentric position, but at the center of rotation of the vertical deflection angle Θ.

V

A horizontal axis 10 is provided on the upper side with respect to the central portion of the element unit 21 at a position decentered by the same amount as in the first embodiment, and a part of the light transmission surface of the cover 43A corresponding to the upper optical system 22 is disposed in the hood. 17 also blocks the aerodynamics. Accordingly, the cover 43A has a shape in which the recessed portion 56 is provided at the central portion in the vertical direction corresponding to the upper optical system 22, and the non-recessed portion 55 is provided on both upper and lower sides of the recessed portion 56. It has become.

[0032] Also in this security sensor device, the same effect as in the first embodiment can be obtained except that the support form of the element unit 21 and the shape of the cover 43A are different from those in the first embodiment. Can do. That is, in the first embodiment, frost formation on the portion of the cover 43 corresponding to the lower optical system 22 is prevented, whereas in this embodiment, the cover 43 A corresponds to the upper optical system 22. The configuration of the non-recessed part 55 can be set to approximately the same dimensions as the cover of a conventional sensor device, with the only difference in the configuration that prevents frost formation on the part, and the same dimensions as the existing hood 17 Therefore, it is possible to obtain the same defrosting effect as that of the first embodiment by providing the step portion 44 having the same size as that of the first embodiment, which does not cause the large shape of the entire shape. it can.

The present invention can be applied to the light projecting unit 1 in FIG. 1 in addition to the light receiving unit 2 exemplified in the above-described embodiment of the security sensor device, as well as passive infrared detection for detecting far infrared rays. It can also be applied to security devices that use security detection devices using these active and passive detection technologies.

[0034] As described above, the preferred embodiments have been described with reference to the drawings. From the present specification, various changes and modifications will be easily envisaged within the obvious range. Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the appended claims.

Claims

The scope of the claims

[1] An element unit including a sensor element that transmits or receives a detection wave is supported by the sensor body so that the horizontal deflection angle and the vertical deflection angle can be adjusted.

A cover that covers the element unit is attached to the sensor body,

The rotation center of the vertical deflection in the element unit is set eccentrically downward or upward with respect to the central part in the vertical direction of the element unit,

In the portion of the cover corresponding to the side where the rotation center of the element unit is eccentric

A recessed portion that is recessed inward of the cover from the other portion is formed through the step portion, and at least one of the detection wave passing regions with respect to the sensor element is located near the upper portion of the rotation center of the cover. A sensor device for crime prevention with a hood that blocks the aerodynamic force of the part.

[2] The security sensor device according to claim 1, wherein the hood is supported by a non-recessed portion on the upper side of the stepped portion of the cover.

[3] The detection wave according to claim 1 or 2, wherein the detection wave is an infrared ray, the element unit has a pair of upper and lower optical systems that project or receive an infrared ray, and the hood is eccentric with respect to the rotation center. A sensor device for crime prevention that performs the above-described blocking with respect to the optical system located on the closed side.

4. The security sensor device according to claim 3, further comprising an additional hood provided on the cover for performing the blocking with respect to the other optical system.